| 1 | An aluminum casting is found to be full of pin holes, the probable cause is: (a) the sand is too wet (b) the air is allowed in too fast (c) the sand is too dry (d) there is too much sand in the casting |
2 | Casting defect caused by the molten metal is: (a) blow holes (b) swell (c) scab (d) All of above | |
| 3 | Which of the following is casting defect: (a) Coining (b) Hot tear (c) Blanking (d) Hot spinning |
4 | Defects resulting from hard ramming: (a) hot tear (b) swells (c) drops (d) cuts and washes |
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| 5 | The main furnace used for casting is the: (a) cupola (b) electric arc (c) bessemer converter (d) puddling furnace |
6 | Blow holes refers to: (a) process of heat treatment (b) casting defect (c) process of joining (d) machining defect |
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| 7 | Casting defect resulting from lack of fluidity: (a) blow holes (b) inclusions (c) shrinkage (d) cold shut |
8 | Which of the following is not a casting defect: (a) mismatch (b) hot tear (c) blowholes (d) scab | |
| 9 | A drop in a casting occurs because: (a) there is no support at the bottom of the mould. (b) the casting is very slippery. (c) The sand in the mould collapses due to the weight of the poured metal. (d) the mould cavity surface chips off due to the high velocity of the metal during pouring. | |||
| 1. | a | 2. | a |
| 3. | b | 4. | a |
| 5. | a | 6. | b |
| 7. | d | 8. | a | 9. | a |